Stroker Piston, Closed Chamber clearance

Now that Im looking to finally do everything correctly. I want to know if the 20.5cc pistons that come in the scat crank with Closed Chamber RHS heads will clear with .022 Head gaskets and Zero Deck. Im trying to find a piston that will give me 10.4-10.7 Compression on the street and still be able to run pump gas with a Cam that is .251-.257 @ 50.

They offer the pistons in 20.5 cc and + 5.50 CC